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Secondary instability development in breaking lee waves at different Reynolds and Prandtl/Schmidt numbers

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Results of DNS/LES study to describe instability (leading to turbulence) in a stratified flow above an obstacle are discussed for a wide range of Reynolds (Re) and Schmidt/Prandtl (Sc) numbers. For high Re and Sc, use of the SGS model allows us to remove numerical noise, obtain adequate spectra and explore fine details of secondary instabilities during the transition to turbulence.

Author(s):

Sergey N. Yakovenko    
Khristianovich Institute of Theoretical amd Applied Mechanics SB RAS
Russian Federation

T. Glyn Thomas    
Faculty of Engineering and the Environment, University of Southampton
United Kingdom

Ian P. Castro    
Faculty of Engineering and the Environment, University of Southampton
United Kingdom